Class: ActiveSupport::HashWithIndifferentAccess

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain: self, `::Hash`
Instance Chain: self, `::Hash`
Inherits:	Hash `::Object` Hash ActiveSupport::HashWithIndifferentAccess
Defined in:	activesupport/lib/active_support/hash_with_indifferent_access.rb

Overview

Implements a hash where keys :foo and "foo" are considered to be the same.

rgb = ActiveSupport::HashWithIndifferentAccess.new

rgb[:black] = '#000000'
rgb[:black]  # => '#000000'
rgb['black'] # => '#000000'

rgb['white'] = '#FFFFFF'
rgb[:white]  # => '#FFFFFF'
rgb['white'] # => '#FFFFFF'

Internally symbols are mapped to strings when used as keys in the entire writing interface (calling #[]=, #merge, etc). This mapping belongs to the public interface. For example, given:

hash = ActiveSupport::HashWithIndifferentAccess.new(a: 1)

You are guaranteed that the key is returned as a string:

hash.keys # => ["a"]

Technically other types of keys are accepted:

hash = ActiveSupport::HashWithIndifferentAccess.new(a: 1)
hash[0] = 0
hash # => {"a"=>1, 0=>0}

but this class is intended for use cases where strings or symbols are the expected keys and it is convenient to understand both as the same. For example the params hash in Ruby on ::Rails.

Note that core extensions define Hash#with_indifferent_access:

rgb = { black: '#000000', white: '#FFFFFF' }.with_indifferent_access

which may be handy.

To access this class outside of ::Rails, require the core extension with:

require "active_support/core_ext/hash/indifferent_access"

which will, in turn, require this file.

Class Method Summary

.[](*args)
.new(constructor = {}) ⇒ HashWithIndifferentAccess constructor

`::Hash` - Inherited

.from_trusted_xml	Builds a `::Hash` from XML just like Hash.from_xml, but also allows `::Symbol` and YAML.
.from_xml	Returns a `::Hash` containing a collection of pairs when the key is the node name and the value is its content.

Instance Attribute Summary

#extractable_options? ⇒ Boolean readonly

Returns true so that Array#extract_options! finds members of this class.

`::Hash` - Inherited

#extractable_options?

By default, only instances of ::Hash itself are extractable.

Instance Method Summary

#[](key)

Same as Hash#[] where the key passed as argument can be either a string or a symbol:
#[]=(key, value) (also: #store)

Assigns a new value to the hash:
#assoc(key)

Same as Hash#assoc where the key passed as argument can be either a string or a symbol:
#compact
#deep_stringify_keys
#deep_stringify_keys!
#deep_symbolize_keys
#default(*args)

Same as Hash#default where the key passed as argument can be either a string or a symbol:
#delete(key)

Removes the specified key from the hash.
#dig(*args)

Same as Hash#dig where the key passed as argument can be either a string or a symbol:
#dup

Returns a shallow copy of the hash.
#fetch(key, *extras)

Same as Hash#fetch where the key passed as argument can be either a string or a symbol:
#fetch_values(*indices, &block)

Returns an array of the values at the specified indices, but also raises an exception when one of the keys can’t be found.
#has_key?(key)

Alias for #key?.
#include?(key)

Alias for #key?.
#key?(key) ⇒ Boolean (also: #include?, #has_key?, #member?)

Checks the hash for a key matching the argument passed in:
#member?(key)

Alias for #key?.
#merge(hash, &block)

This method has the same semantics of #update, except it does not modify the receiver but rather returns a new hash with indifferent access with the result of the merge.
#merge!(other_hash)

Alias for #update.
#nested_under_indifferent_access
#regular_update
#regular_writer
#reject(*args, &block)
#replace(other_hash)

Replaces the contents of this hash with other_hash.
#reverse_merge(other_hash) (also: #with_defaults)

Like #merge but the other way around: Merges the receiver into the argument and returns a new hash with indifferent access as result:
#reverse_merge!(other_hash) (also: #with_defaults!)

Same semantics as #reverse_merge but modifies the receiver in-place.
#select(*args, &block)
#slice(*keys)
#slice!(*keys)
#store(key, value)

Alias for #[]=.
#stringify_keys
#stringify_keys!
#symbolize_keys (also: #to_options)
#to_hash

Convert to a regular hash with string keys.
#to_options

Alias for #symbolize_keys.
#to_options!
#transform_keys(*args, &block)
#transform_keys!
#transform_values(*args, &block)
#update(other_hash) (also: #merge!)

Updates the receiver in-place, merging in the hash passed as argument:
#values_at(*indices)

Returns an array of the values at the specified indices:
#with_defaults(other_hash)

Alias for #reverse_merge.
#with_defaults!(other_hash)

Alias for #reverse_merge!.
#with_indifferent_access
#convert_key(key) private
#convert_value(value, options = {}) private
#set_defaults(target) private

`::Hash` - Inherited

#assert_valid_keys	Validates all keys in a hash match `*valid_keys`, raising `ArgumentError` on a mismatch.
#blank?	A hash is blank if it’s empty:
#compact	Returns a hash with non `nil` values.
#compact!	Replaces current hash with non `nil` values.
#deep_dup	Returns a deep copy of hash.
#deep_merge	Returns a new hash with `self` and `other_hash` merged recursively.
#deep_merge!	Same as `deep_merge`, but modifies `self`.
#deep_stringify_keys	Returns a new hash with all keys converted to strings.
#deep_stringify_keys!	Destructively converts all keys to strings.
#deep_symbolize_keys	Returns a new hash with all keys converted to symbols, as long as they respond to `to_sym`.
#deep_symbolize_keys!	Destructively converts all keys to symbols, as long as they respond to `to_sym`.
#deep_transform_keys	Returns a new hash with all keys converted by the block operation.
#deep_transform_keys!	Destructively converts all keys by using the block operation.
#except	Returns a hash that includes everything except given keys.
#except!	Removes the given keys from hash and returns it.
#extract!	Removes and returns the key/value pairs matching the given keys.
#nested_under_indifferent_access	Alias for Hash#with_indifferent_access.
#reverse_merge	Merges the caller into `other_hash`.
#reverse_merge!	Destructive #reverse_merge.
#reverse_update	Alias for Hash#reverse_merge!.
#slice	Slices a hash to include only the given keys.
#slice!	Replaces the hash with only the given keys.
#stringify_keys	Returns a new hash with all keys converted to strings.
#stringify_keys!	Destructively converts all keys to strings.
#symbolize_keys	Returns a new hash with all keys converted to symbols, as long as they respond to `to_sym`.
#symbolize_keys!	Destructively converts all keys to symbols, as long as they respond to `to_sym`.
#to_options	Alias for Hash#symbolize_keys.
#to_options!	Alias for Hash#symbolize_keys!.
#to_param	Alias for Hash#to_query.
#to_query	Returns a string representation of the receiver suitable for use as a URL query string:
#to_xml	Returns a string containing an XML representation of its receiver:
#transform_keys	Returns a new hash with all keys converted using the `block` operation.
#transform_keys!	Destructively converts all keys using the `block` operations.
#transform_values	Returns a new hash with the results of running `block` once for every value.
#transform_values!	Destructively converts all values using the `block` operations.
#with_defaults	Alias for Hash#reverse_merge.
#with_defaults!	Alias for Hash#reverse_merge!.
#with_indifferent_access	Returns an `HashWithIndifferentAccess` out of its receiver:

Constructor Details

.new(constructor = {}) ⇒ `HashWithIndifferentAccess`

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 66


def initialize(constructor = {})
  if constructor.respond_to?(:to_hash)
    super()
    update(constructor)

    hash = constructor.to_hash
    self.default = hash.default if hash.default
    self.default_proc = hash.default_proc if hash.default_proc
  else
    super(constructor)
  end
end

Class Method Details

.[](*args)

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 79


def self.[](*args)
  new.merge!(Hash[*args])
end

Instance Attribute Details

#extractable_options? ⇒ `Boolean` (readonly)

Returns true so that Array#extract_options! finds members of this class.

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 54


def extractable_options?
  true
end

Instance Method Details

#[](key)

Same as Hash#[] where the key passed as argument can be either a string or a symbol:

counters = ActiveSupport::HashWithIndifferentAccess.new
counters[:foo] = 1

counters['foo'] # => 1
counters[:foo]  # => 1
counters[:zoo]  # => nil

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 162


def [](key)
  super(convert_key(key))
end

#[]=(key, value) Also known as: #store

Assigns a new value to the hash:

hash = ActiveSupport::HashWithIndifferentAccess.new
hash[:key] = 'value'

This value can be later fetched using either :key or 'key'.

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 92


def []=(key, value)
  regular_writer(convert_key(key), convert_value(value, for: :assignment))
end

#assoc(key)

Same as Hash#assoc where the key passed as argument can be either a string or a symbol:

counters = ActiveSupport::HashWithIndifferentAccess.new
counters[:foo] = 1

counters.assoc('foo') # => ["foo", 1]
counters.assoc(:foo)  # => ["foo", 1]
counters.assoc(:zoo)  # => nil

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 175


def assoc(key)
  super(convert_key(key))
end

#compact

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 346


def compact
  dup.tap(&:compact!)
end

#convert_key(key) (private)

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 362


def convert_key(key) # :doc:
  key.kind_of?(Symbol) ? key.to_s : key
end

#convert_value(value, options = {}) (private)

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 366


def convert_value(value, options = {}) # :doc:
  if value.is_a? Hash
    if options[:for] == :to_hash
      value.to_hash
    else
      value.nested_under_indifferent_access
    end
  elsif value.is_a?(Array)
    if options[:for] != :assignment || value.frozen?
      value = value.dup
    end
    value.map! { |e| convert_value(e, options) }
  else
    value
  end
end

#deep_stringify_keys

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 300


def deep_stringify_keys; dup end

#deep_stringify_keys!

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 298


def deep_stringify_keys!; self end

#deep_symbolize_keys

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 305


def deep_symbolize_keys; to_hash.deep_symbolize_keys! end

#default(*args)

Same as Hash#default where the key passed as argument can be either a string or a symbol:

hash = ActiveSupport::HashWithIndifferentAccess.new(1)
hash.default                   # => 1

hash = ActiveSupport::HashWithIndifferentAccess.new { |hash, key| key }
hash.default                   # => nil
hash.default('foo')            # => 'foo'
hash.default(:foo)             # => 'foo'

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 219


def default(*args)
  super(*args.map { |arg| convert_key(arg) })
end

#delete(key)

Removes the specified key from the hash.

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 293


def delete(key)
  super(convert_key(key))
end

#dig(*args)

Same as Hash#dig where the key passed as argument can be either a string or a symbol:

counters = ActiveSupport::HashWithIndifferentAccess.new
counters[:foo] = { bar: 1 }

counters.dig('foo', 'bar')     # => 1
counters.dig(:foo, :bar)       # => 1
counters.dig(:zoo)             # => nil

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 203


def dig(*args)
  args[0] = convert_key(args[0]) if args.size > 0
  super(*args)
end

#dup

Returns a shallow copy of the hash.

hash = ActiveSupport::HashWithIndifferentAccess.new({ a: { b: 'b' } })
dup  = hash.dup
dup[:a][:c] = 'c'

hash[:a][:c] # => "c"
dup[:a][:c]  # => "c"

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 254


def dup
  self.class.new(self).tap do |new_hash|
    set_defaults(new_hash)
  end
end

#fetch(key, *extras)

Same as Hash#fetch where the key passed as argument can be either a string or a symbol:

counters = ActiveSupport::HashWithIndifferentAccess.new
counters[:foo] = 1

counters.fetch('foo')          # => 1
counters.fetch(:bar, 0)        # => 0
counters.fetch(:bar) { |key| 0 } # => 0
counters.fetch(:zoo)           # => KeyError: key not found: "zoo"

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 189


def fetch(key, *extras)
  super(convert_key(key), *extras)
end

#fetch_values(*indices, &block)

Returns an array of the values at the specified indices, but also raises an exception when one of the keys can’t be found.

hash = ActiveSupport::HashWithIndifferentAccess.new
hash[:a] = 'x'
hash[:b] = 'y'
hash.fetch_values('a', 'b') # => ["x", "y"]
hash.fetch_values('a', 'c') { |key| 'z' } # => ["x", "z"]
hash.fetch_values('a', 'c') # => KeyError: key not found: "c"

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 242


def fetch_values(*indices, &block)
  indices.collect { |key| fetch(key, &block) }
end

#has_key?(key)

Alias for #key?.

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 150


alias_method :has_key?, :key?

#include?(key)

Alias for #key?.

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 149


alias_method :include?, :key?

#key?(key) ⇒ `Boolean` Also known as: #include?, #has_key?, #member?

Checks the hash for a key matching the argument passed in:

hash = ActiveSupport::HashWithIndifferentAccess.new
hash['key'] = 'value'
hash.key?(:key)  # => true
hash.key?('key') # => true

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 145


def key?(key)
  super(convert_key(key))
end

#member?(key)

Alias for #key?.

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 151


alias_method :member?, :key?

#merge(hash, &block)

This method has the same semantics of #update, except it does not modify the receiver but rather returns a new hash with indifferent access with the result of the merge.

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 263


def merge(hash, &block)
  dup.update(hash, &block)
end

#merge!(other_hash)

Alias for #update.

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 137


alias_method :merge!, :update

#nested_under_indifferent_access

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 62


def nested_under_indifferent_access
  self
end

#regular_update

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 84


alias_method :regular_update, :update unless method_defined?(:regular_update)

#regular_writer

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 83


alias_method :regular_writer, :[]= unless method_defined?(:regular_writer)

#reject(*args, &block)

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 313


def reject(*args, &block)
  return to_enum(:reject) unless block_given?
  dup.tap { |hash| hash.reject!(*args, &block) }
end

#replace(other_hash)

Replaces the contents of this hash with other_hash.

h = { "a" => 100, "b" => 200 }
h.replace({ "c" => 300, "d" => 400 }) # => {"c"=>300, "d"=>400}

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 288


def replace(other_hash)
  super(self.class.new(other_hash))
end

#reverse_merge(other_hash) Also known as: #with_defaults

Like #merge but the other way around: Merges the receiver into the argument and returns a new hash with indifferent access as result:

hash = ActiveSupport::HashWithIndifferentAccess.new
hash['a'] = nil
hash.reverse_merge(a: 0, b: 1) # => {"a"=>nil, "b"=>1}

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 273


def reverse_merge(other_hash)
  super(self.class.new(other_hash))
end

#reverse_merge!(other_hash) Also known as: #with_defaults!

Same semantics as #reverse_merge but modifies the receiver in-place.

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 279


def reverse_merge!(other_hash)
  super(self.class.new(other_hash))
end

#select(*args, &block)

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 308


def select(*args, &block)
  return to_enum(:select) unless block_given?
  dup.tap { |hash| hash.select!(*args, &block) }
end

#set_defaults(target) (private)

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 383


def set_defaults(target) # :doc:
  if default_proc
    target.default_proc = default_proc.dup
  else
    target.default = default
  end
end

#slice(*keys)

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 336


def slice(*keys)
  keys.map! { |key| convert_key(key) }
  self.class.new(super)
end

#slice!(*keys)

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 341


def slice!(*keys)
  keys.map! { |key| convert_key(key) }
  super
end

#store(key, value)

Alias for #[]=.

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 96


alias_method :store, :[]=

#stringify_keys

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 299


def stringify_keys; dup end

#stringify_keys!

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 297


def stringify_keys!; self end

#symbolize_keys Also known as: #to_options

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 303


def symbolize_keys; to_hash.symbolize_keys! end

#to_hash

Convert to a regular hash with string keys.

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 351


def to_hash
  _new_hash = Hash.new
  set_defaults(_new_hash)

  each do |key, value|
    _new_hash[key] = convert_value(value, for: :to_hash)
  end
  _new_hash
end

#to_options

Alias for #symbolize_keys.

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 304


alias_method :to_options, :symbolize_keys

#to_options!

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 306


def to_options!; self end

#transform_keys(*args, &block)

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 323


def transform_keys(*args, &block)
  return to_enum(:transform_keys) unless block_given?
  dup.tap { |hash| hash.transform_keys!(*args, &block) }
end

#transform_keys!

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 328


def transform_keys!
  return enum_for(:transform_keys!) { size } unless block_given?
  keys.each do |key|
    self[yield(key)] = delete(key)
  end
  self
end

#transform_values(*args, &block)

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 318


def transform_values(*args, &block)
  return to_enum(:transform_values) unless block_given?
  dup.tap { |hash| hash.transform_values!(*args, &block) }
end

#update(other_hash) Also known as: #merge!

Updates the receiver in-place, merging in the hash passed as argument:

hash_1 = ActiveSupport::HashWithIndifferentAccess.new
hash_1[:key] = 'value'

hash_2 = ActiveSupport::HashWithIndifferentAccess.new
hash_2[:key] = 'New Value!'

hash_1.update(hash_2) # => {"key"=>"New Value!"}

The argument can be either an HashWithIndifferentAccess or a regular ::Hash. In either case the merge respects the semantics of indifferent access.

If the argument is a regular hash with keys :key and “key” only one of the values end up in the receiver, but which one is unspecified.

When given a block, the value for duplicated keys will be determined by the result of invoking the block with the duplicated key, the value in the receiver, and the value in other_hash. The rules for duplicated keys follow the semantics of indifferent access:

hash_1[:key] = 10
hash_2['key'] = 12
hash_1.update(hash_2) { |key, old, new| old + new } # => {"key"=>22}

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 123


def update(other_hash)
  if other_hash.is_a? HashWithIndifferentAccess
    super(other_hash)
  else
    other_hash.to_hash.each_pair do |key, value|
      if block_given? && key?(key)
        value = yield(convert_key(key), self[key], value)
      end
      regular_writer(convert_key(key), convert_value(value))
    end
    self
  end
end

#values_at(*indices)

Returns an array of the values at the specified indices:

hash = ActiveSupport::HashWithIndifferentAccess.new
hash[:a] = 'x'
hash[:b] = 'y'
hash.values_at('a', 'b') # => ["x", "y"]

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 229


def values_at(*indices)
  indices.collect { |key| self[convert_key(key)] }
end

#with_defaults(other_hash)

Alias for #reverse_merge.

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 276


alias_method :with_defaults, :reverse_merge

#with_defaults!(other_hash)

Alias for #reverse_merge!.

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 282


alias_method :with_defaults!, :reverse_merge!

#with_indifferent_access

[ GitHub ]

# File 'activesupport/lib/active_support/hash_with_indifferent_access.rb', line 58


def with_indifferent_access
  dup
end

Class: ActiveSupport::HashWithIndifferentAccess

Overview

Class Method Summary

::Hash - Inherited

Instance Attribute Summary

::Hash - Inherited

Instance Method Summary

::Hash - Inherited

Constructor Details

.new(constructor = {}) ⇒ HashWithIndifferentAccess

Class Method Details

.[](*args)

Instance Attribute Details

#extractable_options? ⇒ Boolean (readonly)

Instance Method Details

#[](key)

#[]=(key, value) Also known as: #store

#assoc(key)

#compact

#convert_key(key) (private)

#convert_value(value, options = {}) (private)

#deep_stringify_keys

#deep_stringify_keys!

#deep_symbolize_keys

#default(*args)

#delete(key)

#dig(*args)

#dup

#fetch(key, *extras)

#fetch_values(*indices, &block)

#has_key?(key)

#include?(key)

#key?(key) ⇒ Boolean Also known as: #include?, #has_key?, #member?

#member?(key)

#merge(hash, &block)

#merge!(other_hash)

#nested_under_indifferent_access

#regular_update

#regular_writer

#reject(*args, &block)

#replace(other_hash)

#reverse_merge(other_hash) Also known as: #with_defaults

#reverse_merge!(other_hash) Also known as: #with_defaults!

#select(*args, &block)

#set_defaults(target) (private)

#slice(*keys)

#slice!(*keys)

#store(key, value)

#stringify_keys

#stringify_keys!

#symbolize_keys Also known as: #to_options

#to_hash

#to_options

#to_options!

#transform_keys(*args, &block)

#transform_keys!

#transform_values(*args, &block)

#update(other_hash) Also known as: #merge!

#values_at(*indices)

#with_defaults(other_hash)

#with_defaults!(other_hash)

#with_indifferent_access

`::Hash` - Inherited

`::Hash` - Inherited

`::Hash` - Inherited

.new(constructor = {}) ⇒ `HashWithIndifferentAccess`

#extractable_options? ⇒ `Boolean` (readonly)

#key?(key) ⇒ `Boolean` Also known as: #include?, #has_key?, #member?